Simultaneous inference of periods and period-luminosity relations for Mira variable stars. (English) Zbl 1478.62379
Summary: The period-luminosity relation (PLR) of Mira variable stars is an important tool to determine astronomical distances. The common approach of estimating the PLR is a two-step procedure that first estimates the Mira periods and then runs a linear regression of magnitude on log period. When the light curves are sparse and noisy, the accuracy of period estimation decreases and can suffer from aliasing effects. Some methods improve accuracy by incorporating complex model structures at the expense of significant computational costs. Another drawback of existing methods is that they only provide point estimation without proper estimation of uncertainty. To overcome these challenges, we develop a hierarchical Bayesian model that simultaneously models the quasi-periodic variations for a collection of Mira light curves while estimating their common PLR. By borrowing strengths through the PLR, our method automatically reduces the aliasing effect, improves the accuracy of period estimation and is capable of characterizing the estimation uncertainty. We develop a scalable stochastic variational inference algorithm for computation that can effectively deal with the multimodal posterior of period. The effectiveness of the proposed method is demonstrated through simulations and an application to observations of Miras in the Local Group galaxy M33. Without using ad hoc period correction tricks, our method achieves a distance estimate of M33 that is consistent with published work. Our method also shows superior robustness to downsampling of the light curves.
MSC:
| 62P35 | Applications of statistics to physics |
| 62M10 | Time series, auto-correlation, regression, etc. in statistics (GARCH) |
| 85A05 | Galactic and stellar dynamics |
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\textit{S. He} et al., Ann. Appl. Stat. 15, No. 2, 662--687 (2021; Zbl 1478.62379)
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